app: Simplify request handlers

There is no need to pass the auth, server, or websocket manager objects to request handlers.  They can be retreived directly from the application reference.

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>

moonraker/websockets.py

@@ -268,9 +268,9 @@ class WebsocketManager:
             self.websockets = {}
 
 class WebSocket(WebSocketHandler):
-    def initialize(self, wsm, auth):
-        self.wsm = wsm
-        self.auth = auth
+    def initialize(self, main_app):
+        self.auth = main_app.get_auth()
+        self.wsm = main_app.get_websocket_manager()
         self.rpc = self.wsm.rpc
         self.uid = id(self)